Use strategy free for git servers

In an effort to improve performance, switch out strategy[1] to free.
This will allow each ansible host to run until the end of the play as
fast as it can.

[1] http://docs.ansible.com/ansible/playbooks_strategies.html

Change-Id: I86588154b71e69399be930fc78be7c17f54fd9dd
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

playbooks/remote_puppet_git.yaml

@@ -1,5 +1,6 @@
 ---
 - hosts: "localhost:!disabled"
+  strategy: free
   gather_facts: true
   connection: local
   tasks:
@@ -12,6 +13,7 @@
       copy_hieradata: False
       copy_puppet: False
 - hosts: "git0*:!disabled"
+  strategy: free
   gather_facts: true
   max_fail_percentage: 1
   roles:
@@ -19,6 +21,7 @@
       facts:
         project_config_ref: "{{ hostvars.localhost.gitinfo.after }}"
 - hosts: "review.openstack.org:!disabled"
+  strategy: free
   gather_facts: true
   roles:
     - role: puppet